Driving device for an air compressor

ABSTRACT

A driving device for an air compressor includes a base, a motor, a main gear, a subordinate gear, a shaft, a weight, and a driving arm combined with an air cylinder and a cylindrical member. When the motor is electrified, the main and the subordinate gear are rotated, with the subordinate gear rotating the shaft, which then rotates the weight. The weight then rotates centrifugally to let a first end of the driving arm rotate and then the piston formed the second end of the driving arm is moved to reciprocate back and forth in the cylindrical member to produce compressed air to flow out for use.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a driving device for an air compressor, particularly to one having a base, a main gear fixed on the base and engaging with a subordinate gear, a weight fixed on the shaft of the subordinate gear, and a driving arm connected with eccentrically with the weight. When a motor is powered, the main gear and the subordinated gear are orderly rotated to let the weight rotate so that the driving arm may eccentrically be moved so that a piston formed at one end of the driving arm and contained in an cylinder member to reciprocate for pushing out a large amount of compressed air.

2. Description of the Prior Art

A conventional air compressor shown in FIGS. 1 and 2, includes a motor 90, a fixing base 91 located in front of the motor 90, a main gear 9 fixed on the spindle of the motor 90, a subordinate gear 93 fixed on the fixing base 91 and engaging with the main gear 92. Further, an eccentric shaft 94 is connected with the subordinate gear 93, and a piston rod 95 is connected with the eccentric shaft 94. Then the piston rod 95 has its end fixed with a piston 96 movably fitted in an air cylinder 97, which has an inlet valve 98 and an outlet valve 99.

When the motor 90 is powered, the main gear 92 is rotated and then the subordinate gear 93 is then rotated accordingly, moving the piston rod 95 with the piston 96 up and down. Then the piston 96 sucks in air during down movement in the air cylinder 97 and then into the air cylinder 97 through the inlet valve 98, and compresses out air in the air cylinder 97 through the outlet valve 99 during up movement therein.

However, in the conventional air compressor the piston 96 generates sucking force during down movement, sucking outer air into the air cylinder 97 in a limited amount, and then presses out air in the air cylinder 97 through the outlet valve 99, but the driving distance and force of the piston rod 95 is comparatively small, and accordingly the air amount compressed out is also comparatively small, not ideal in the inlet and outlet amount of air.

SUMMARY OF THE INVENTION

This invention has been devised to offer a driving device for an air compressor, which is possible to produce a large amount of air pressure to obtain preferable intake and outgo of air pressure.

The feature of the invention is a motor, a main gear, a subordinate gear, a weight fixed on a shaft, and a driving arm having a piston at an end, and a air cylinder and a cylindrical member combined together. The motor is combined with a rear side of a base, having a spindle, and the main gear is fixed on the spindle and engaging with the subordinate gear fixed on the shaft, which the driving arm has its one end combined with. So when the motor is powered, the main and the subordinate gear are rotated together, and then the shaft rotates with the subordinate gear, also rotating the weight and a first end of the driving arm connected eccentrically with the weight so that the piston formed at a second end of the driving arm may be moved to reciprocate back and forth in the cylindrical member to suck in air and compress out air out of the air cylinder to obtain a large amount of compressed air.

BRIEF DESCRIPTION OF DRAWINGS

This invention will be better understood by referring to the accompanying drawings, wherein:

FIG. 1 is a simple view of a conventional air compressor with air sucking condition;

FIG. 2 is a simple cross-sectional view of the conventional air compressor;

FIG. 3 is an exploded perspective view of a driving device for an air compressor in the present invention;

FIG. 4 is a perspective view of the driving device for an air compressor in the present invention;

FIG. 5 is a cross-sectional view of the driving device for an air compressor in the present invention, showing air compressed out;

FIG. 6 is a cross-sectional view of the driving device for the air compressor in the present invention, showing air sucked in; and, FIG. 7 is a cross-sectional view of the driving device for the air compressor in the present invention, showing the piston moved to the outermost point.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A preferred embodiment of a driving device for an air compressor in the present invention, as shown in FIGS. 3, 4 and 5, includes a base 1, a motor 10, a main gear 11, a subordinate gear 2, a shaft 14, a weight 3, a driving arm 4, an air cylinder 5, and a cylindrical member 54 as main components.

The motor 10 is fixed with a rear side of the base 1, and the base 1 has a hole 12 for two bearings 13 to fit therein, and a shaft 14 fitted though the two bearings 13.

The main gear 11 is fixed on the spindle of the motor 10, and located in parallel beside the hole 12 of the base 1.

The subordinate gear 2 is fixed on a rear end of the shaft 14 with a screw 20, engaging with the main gear 11 to rotate together.

The weight 3 is preferably fan-shaped, fixed eccentrically on a front end of the shaft 14 at its small end, having a shaft hole 30 and a threaded hole 31 in the small end.

The driving arm 4 has its first end eccentrically connected with the weight 3, having the first end formed with a hole 40, with a bearing 41 fitted in the hole 40 and a screw 42 passing through the bearing 41 and screwing with the weight 3. The driving arm 4 has its second end formed with a piston 43.

The air cylinder 5 is combined laterally with the front end of the base 1 by means of plural bolts 6, provided with a recess 40 in a front portion, an air outlet 51 formed in the recess 40, a disc 52 with a through hole 520 and two gaskets 53 sandwiching the disc 52 fitted in the recess 50. Further, a cylindrical member 54 is provided, having one end fitted stably in the recess 50 and the other end connected with the base 1. The piston 43 of the driving arm 4 is movably contained in the cylindrical member 54.

In using, referring to FIGS. 4, 5, 6 and 7, the motor 10 is first powered, and the main gear 11 is rotated by the motor 10, with the subordinate gear 2 also rotated by the main gear 11. Then the shaft 14 is rotated together with the subordinate gear 2, driving the weight 3, which rotates one end of the driving arm 4, which then moves in a line to let the piston 43 to reciprocate back and forth in the cylindrical member 54. Then the weight 3 is rotated to swing around centrifugally, with the first end of the driving arm 4 rotating. When the larger portion of the weight 3 moved to the outer side, the piston 43 is pushed to move further into the interior of the cylindrical member 54, as shown in FIG. 5, with air squeezed through the through hole 520 of the disc 52 to flow out of the outlet 51. As the weight 3 is rotating to have its larger portion coming to the upper side, the first end of the driving arm 4 is rotating downward, making the piston 43 inclined as shown in FIG. 6, with a gap formed between the lower side of the piston 43 and the inner wall of he cylindrical member 54, so that outer air flows into the cylindrical member 54, as the piston 43 moving outward may cause sucking force.

When the larger portion of the weight 3 rotates to move to the inner side, the piston 43 moves to the outermost point in the cylindrical member 54, as shown in FIG. 7, with the piston 43 becoming located in parallel to the cylindrical member 54 in a sealed condition. In this way, the weight 3 is further rotated by the subordinate gear 2 to move the piston 43 reciprocate forcefully in the cylindrical member 54, compressing out the air in the cylindrical member 54.

As can be seen from the aforesaid description, the engagement and rotation of the main gear 11 and the subordinate 2 gear can force the weight 3 rotate stably and accurately so that the weight 3 can move the first end of the driving arm 4 to let the piston 43 reciprocate in the cylindrical member 54 and compressing a large amount of air for producing the most preferable intake and outgo of compressed air.

While the preferred embodiment of the invention has been described above, it will be recognize and understood that various modifications may be made therein and appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention. 

1. A driving device for an air compressor, said driving device comprising: a base having a hole at a front-end, said hole having two bearings fitted therein, a shaft fitted through said two bearings; a motor fixed at a rear side of said base, said motor having a spindle; a main gear fixed on said spindle of said motor; a subordinate gear fixed on a rear end of said shaft in said hole of said base and engaging with said main gear; a weight of a preferably fan-shaped fixed on an outer end of said shaft; a driving shaft having a first end combined eccentrically with said weight by means of a screw and having a hole at said first end, a bearing fitted in said hole, said driving shaft having a second end formed with a piston; an air cylinder fixed laterally at a front end of said base and having a recess, an air outlet formed in said recess, a disc with a through hole and two gaskets sandwiching said disc fitted in said recess, a cylindrical member having one end fixed with said recess of said air cylinder and the other end connected with said base, said piston of said driving arm movably fitted in said cylindrical member; and, said driving arm moved to reciprocate back and forth by said weight rotated by said main gear and said subordinate gear after said motor is powered to rotate said main gear, said piston of said driving arm thus moved to reciprocate in said cylindrical member so that air can be sucked in and compressed to be exhausted out of said air cylinder to produce compressed air for use. 